The decision last week to allow the South African double amputee Oscar Pistorius to try out for the Olympics, widely reported around the world on May 16 and 17, ends a four-year dispute about whether his artificial legs might actually give him and others like him an unfair advantage. Ironically, advances in prosthetics engineering had been so impressive, a runner born without legs might do better using artificial legs than a full-bodied athlete. At that time, the Paris-based freelancer Marlowe Hood gave a probing account of the situation and the complex issues it raised in Spectrum Onlineâ''a discussion that's